from django.shortcuts import render
from django.contrib.auth.decorators import login_required
from django.http import HttpResponseRedirect, Http404
from django.core.urlresolvers import reverse
from . models import Topic, Entry
from .forms import TopicForm, EntryForm
# Create your views here.

def index(request):
    return render(request, 'learning_logs/index.html')

@login_required
def topics(request):
    """显示所有的主体"""
    #owner等于从请求中带过来的用户id
    topics = Topic.objects.filter(owner=request.user).order_by('date_added')
    context = {'topics':topics}
    return render(request, 'learning_logs/topics.html',context)

@login_required
def topic(request, topic_id):
    topic = Topic.objects.get(id = topic_id)
    #判断用户id和请求中id是否相同
    if topic.owner != request.user:
        raise Http404
    entries = topic.entry_set.order_by('-date_added')
    context = {'topic':topic, 'entries':entries}
    return render(request, 'learning_logs/topic.html', context)

@login_required
def new_topic(request):
    """添加新主题"""
    if request.method != 'POST':
        form = TopicForm
    else:
        form = TopicForm(request.POST)
        if form.is_valid():
            #将文章内容id和请求id进行绑定
            new_topic = form.save(commit=False)
            new_topic.owner = request.user
            new_topic.save()

            return HttpResponseRedirect(reverse('learning_logs:topics'))
    context = {'form':form}
    return render(request, 'learning_logs/new_topic.html', context)

@login_required
def new_entry(request, topic_id):
    topic = Topic.objects.get(id=topic_id)
    if request.method != 'POST':
        form = EntryForm()
    else:
        form = EntryForm(data=request.POST)
        if form.is_valid():
            new_entry = form.save(commit=False)
            new_entry.topic = topic
            new_entry.save()
            return HttpResponseRedirect(reverse('learning_logs:topic', args=[topic_id]))

    context = {'topic': topic, 'form':form}
    return render(request, 'learning_logs/new_entry.html', context)

@login_required
def edit_entry(request, entry_id):
    entry = Entry.objects.get(id=entry_id)
    topic = entry.topic

    if request.method != 'POST':
        form = EntryForm(instance=entry)
    else:
        form = EntryForm(instance=entry, data=request.POST)
        if form.is_valid():
            form.save()
            return HttpResponseRedirect(reverse('learning_logs:topic', args=[topic.id]))
    context = {'entry':entry, 'topic': topic, 'form':form}
    return render(request, 'learning_logs/edit_entry.html', context)

